Dispositivos lógicos lineares totalmente ópticos em acopladores de fibra de cristal fotônico de três núcleos

Abstract

The growth in global data traffic and the demand for energy efficiency in Artificial Intelligence training have driven the search for alternatives that overcome the limitations of conventional electronic processing. This reality has led the computer engineering community to revisit paradigms established in recent decades. Traditionally, the premise has been consolidated that all-optical processing strictly requires highly nonlinear media (such as the Kerr effect) or the mediation of optoelectronic devices with successive electro-optic conversions. This work demonstrates a paradigm shift by presenting the analytical design and numerical validation of two all-optical logic devices operating strictly in the linear regime: a multifunctional logic gate and a configurable multifunctional logic device. In both architectures, the fundamental Boolean operations OR and AND are dynamically enabled based on the logic levels input into a selector channel. Each component is structured from a single Photonic Crystal Fiber (PCF) segment composed of three coupled cores, arranged in planar and triangular layouts, respectively. Robust mathematical modeling demonstrates that the control and routing of light states occur purely in the linear regime through coupling guided by the fiber’s geometric design, enabling the processing of ultrashort, low-power pulses with a high contrast ratio via Pulse Amplitude Modulation (PAM). Interconnecting the fundamentals of Applied Electromagnetics and Digital Systems Engineering, this thesis establishes the microstructured design of functional fibers as a viable, high-performance platform for native optical computing.